# Copyright 2021 Huawei Technologies Co., Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============================================================================
""" Produce the meta dataset. """


class Meta(type):
    """Meta class"""

    def __init__(cls, class_name, class_bases, class_dic):
        super().__init__(class_name, class_bases, class_dic)

    def __call__(cls, *args, **kwargs):
        obj = object.__new__(cls)
        cls.__init__(obj, *args, **kwargs)
        if obj.download:
            return None
        obj._pipeline()  # pylint: disable=W0212

        return obj.dataset
